A system and method for removing residual coke powder inside a charcoal burner

Abstract

This invention belongs to the field of coal chemical technology and discloses a system and method for removing residual coke in a charcoal burner. The removal system includes a charcoal burner with a heat carrier riser at its bottom. An air inlet and a first coke outlet at the bottom of the riser are connected to an oxygen supply fan and a first gas-solid separation device, respectively. A second flue gas outlet and a second coke outlet on the first gas-solid separation device are connected to a second gas-solid separation device and a coke collection box A, respectively. A third flue gas outlet and a third coke outlet on the second gas-solid separation device are connected to an exhaust fan and a coke collection box B, respectively. After shutdown, the residual coke at the bottom of the charcoal burner is drawn into the first and second gas-solid separation devices by the combined action of the air supplied by the oxygen supply fan and the pneumatic force provided by the exhaust fan, undergoing dual separation. This achieves the removal of residual coke in the charcoal burner and also avoids pollution of the working area or surrounding environment during the extraction process.

Description

Technical Field

[0001] This invention relates to the field of coal chemical technology, and in particular to a system and method for removing residual coke powder in a charcoal burner. Background Technology

[0002] The graded and graded utilization of coal is usually based on coal pyrolysis technology, which can give full play to the characteristics and advantages of coal resources. Based on the composition and structural characteristics of coal, coal is converted into three forms of products: gas (coal gas), liquid (tar), and solid (semi-coke / pulverized coke). The products are then further processed and utilized according to their characteristics. The environmental pollutants generated are removed in a concentrated manner, so as to achieve high utilization rate and clean use of coal resources.

[0003] In the pyrolysis process of pulverized coal, the coke burner, as the core equipment of the pulverized coal pyrolysis unit, is mainly used to hold the solid circulating heat carrier pulverized coke, thereby providing heat for the combustion reaction of pulverized coal. However, the solids (semi-coke / pulverized coke) produced in the pulverized coal pyrolysis process are characterized by small fine particles, low density, irregular shape, high content of heavy components in tar vapor, and strong adhesion of fine particles. These characteristics can easily cause blockage or damage to the unit's pipelines and valves, affecting the long-term stable operation of the unit.

[0004] Therefore, after a long period of operation, the equipment often faces an annual shutdown for major maintenance. During the maintenance process, the coke burner needs to be decoked. Most of the coke powder inside the coke burner can be easily removed, but there are still dead zones for decoking in the part of the heat carrier riser that extends into the coke burner, which are difficult to clean.

[0005] Therefore, the present invention provides a system and method for removing residual coke powder inside a charcoal burner. Summary of the Invention

[0006] To address the shortcomings of the prior art, the present invention provides a system and method for removing residual coke powder inside a charcoal burner.

[0007] The present invention provides a system and method for removing residual coke powder inside a charcoal burner, which is achieved through the following technical solution:

[0008] The first objective of this invention is to provide a system for removing residual coke powder inside a charcoal burner, comprising:

[0009] A charcoal burner has a first flue gas outlet at its upper end, which is used to discharge the flue gas from the top of the charcoal burner; and an air inlet and a first coke powder outlet at its lower end.

[0010] A heat carrier riser is vertically installed at the bottom of the charcoal burner, with its upper end extending upward into the charcoal burner; and its lower end is connected to a reactor.

[0011] An oxygen supply fan, the outlet of which is connected to the inlet, provides oxygen to the charcoal burner;

[0012] The first gas-solid separation device has its inlet end connected to the first coke powder outlet, and is provided with a second flue gas outlet and a second coke powder outlet; the residue discharged from the first coke powder outlet is separated into gas phase components and solid phase components, which are then discharged from the second flue gas outlet and the second coke powder outlet respectively; a coke powder collection box A is connected to the second coke powder outlet.

[0013] The second gas-solid separation device has its inlet end connected to the second flue gas outlet, and is provided with a third flue gas outlet and a third coke powder outlet, so as to further separate the components discharged from the second flue gas outlet into gas phase components and solid phase components, which are discharged from the third flue gas outlet and the third coke powder outlet respectively; the third coke powder outlet is connected to a coke powder collection box B.

[0014] The exhaust fan has its inlet connected to the third flue gas outlet.

[0015] Furthermore, a density detector is also installed inside the charcoal burner to monitor the density of the residual coke powder at the bottom of the charcoal burner (coke powder density ≤ 5 kg / cm³). 3 hour).

[0016] Furthermore, the inlet of the first gas-solid separation device is connected to the first coke outlet through a coke powder conduit, and a slide valve is provided on the coke powder conduit. The slide valve is only opened when the coke powder at the bottom of the coke burner is removed after shutdown, and remains closed during normal production.

[0017] Furthermore, several of the first gas-solid separation device, the second gas-solid separation device, and the exhaust fan are provided;

[0018] Furthermore, several second gas-solid separation devices are connected in series with the first gas-solid separation device in a one-to-one correspondence;

[0019] Several of the aforementioned exhaust fans are connected in series with the second gas-solid separation device in a one-to-one correspondence.

[0020] Furthermore, the first gas-solid separation device is a cyclone separator.

[0021] Furthermore, the second gas-solid separation device is a dust collector bag filter, and the dust collector bag filter is a dust collector bag filter equipped with a mobile jet cleaning device, which is used to perform mobile jet cleaning on the second gas-solid separation unit to avoid clogging of the dust collector bag filter and reduce the efficiency of removing coke powder.

[0022] Furthermore, the mobile jet cleaning device is a mobile jet cleaning device equipped with a sequential control system. It is electrically connected to the sequential control system and, under the action of the sequential control system, blows the dust collector bag filter to achieve timely blowing and declogging.

[0023] Furthermore, the first gas-solid separation device is equipped with a wing valve inside and a slide valve at the bottom.

[0024] The second objective of this invention is to provide a method for removing residual coke powder from a charcoal burner based on the above-mentioned system for removing residual coke powder from a charcoal burner, comprising the following steps:

[0025] Step 1: Fluidize the residual coke powder at the bottom of the charcoal burner.

[0026] After shutdown, when the temperature inside the charcoal burner drops to ≤100℃, connect the first coke outlet of the charcoal burner to the first gas-solid separation device, start the oxygen supply fan to provide conveying gas, so that the residual coke at the bottom of the charcoal burner is in a fluidized state.

[0027] Step 2, Preliminary separation process

[0028] Turn on the exhaust fan to provide airflow, so that the residual coke in the fluidized state enters the first gas-solid separation device under the action of the conveying air provided by the oxygen supply fan and the airflow provided by the exhaust fan, so as to separate it into gas phase component A and solid phase component A; the solid phase component A is introduced into the coke collection box A.

[0029] Step 3, Secondary separation process

[0030] Under the combined action of the conveying gas provided by the oxygen supply fan and the aerodynamic force provided by the exhaust fan, the gas phase component A is introduced into the second gas-solid separation device to further separate the component discharged from the second flue gas outlet into gas phase component B and solid phase component B; the solid phase component B is introduced into the coke powder collection box B.

[0031] The density of the residual coke powder at the bottom of the charcoal burner is ≤5 kg / cm³. 3 At this time, the removal of the charcoal residue at the bottom of the charcoal burner is completed.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] After the charcoal burner stops operating, the temperature inside the burner drops to ≤100℃, and the combustion reaction ceases. The residual coke at the bottom of the burner is then drawn into the first and second gas-solid separation devices in sequence by the combined action of the conveying air provided by the oxygen supply fan and the pneumatic power provided by the exhaust fan. The two gas-solid separation devices, connected in series, separate the residual coke mixture into gaseous and solid components. The resulting solid components are then introduced into the coke collection box. This process not only removes the residual coke from the burner but also prevents the coke from polluting the work area or the surrounding environment during extraction.

[0034] This invention, by installing an exhaust fan at the flue gas outlet of the second gas-solid separation device, can not only remove the residual coke and conveying gas at the bottom of the charcoal burner, but also establish a working line velocity for the gas-solid separation device, which helps to achieve rapid separation of coke and conveying gas.

[0035] The coke residue removal system in the charcoal burner of the present invention is simple to operate, not only making it easy to handle the residual coke in the dead corners of the charcoal burner after shutdown, but also ensuring good sealing between each connecting pipe and the conveying channel, preventing coke leakage and possessing environmentally friendly characteristics. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a coke dust removal system inside a charcoal burner according to the present invention. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0038] Example 1

[0039] This embodiment provides a system for removing residual coke in a charcoal burner, including a charcoal burner 1 and a heat carrier riser 2. The heat carrier riser 2 is vertically installed at the bottom of the charcoal burner 1, with its upper end extending upwards into the charcoal burner 1. The lower end of the heat carrier riser 2 is connected to a reactor 3. During normal operation, the heat carrier enters the reactor 3 from the bottom outlet of the charcoal burner 1 through the heat carrier riser 2. The heat carrier riser 2 is used for the flow of the heat carrier coke, providing heat for the combustion reaction of pulverized coal. When the system is shut down, because part of the heat carrier riser 2 extends into the charcoal burner 1, the residual coke at the bottom of the charcoal burner 1 becomes difficult to clean.

[0040] Please see Figure 1To avoid the accumulation of residual coke powder at the bottom of the charcoal burner 1, this invention provides a first flue gas outlet 11 at the upper end of the charcoal burner 1, which is connected to the inlet of the downstream device to facilitate subsequent treatment of the flue gas discharged from the first flue gas outlet 11. Furthermore, an air inlet 12 and a first coke powder outlet 13 are respectively provided on both sides of the lower end of the charcoal burner 1. The first coke powder outlet 13 is connected to the inlet of the first gas-solid separation device 5, and the air inlet 12 is connected to the outlet of the oxygen supply fan 4. During normal production, the first coke powder outlet 13 remains closed, while the air inlet 12 can be open to establish a fluidized state of the coke powder at the bottom of the charcoal burner 1 through the oxygen supply fan 4, and to provide the necessary air for the reaction and combustion. After shutdown, when the temperature inside the charcoal burner 1 drops to ≤100℃, the first coke outlet 13 is opened, connecting the charcoal burner 1 to the first gas-solid separation device 5. Under the action of the oxygen supply fan 4, the residual coke at the bottom of the charcoal burner 1 is fluidized and transported to the first gas-solid separation device 5. The first gas-solid separation device 5 separates the residue discharged from the first coke outlet 13 into gas phase component A and solid phase component A. The gas phase component A is discharged from the second flue gas outlet 51 at the upper end of the first gas-solid separation device 5 to the second gas-solid separation device 7 for further separation and processing. The solid phase component A is discharged from the second coke outlet 52 to the coke collection box A6, thereby achieving primary removal and recovery of the residual coke at the bottom of the charcoal burner 1.

[0041] After gaseous component A enters the second gas-solid separation device 7 through the second flue gas outlet 51, the second gas-solid separation device 7 further separates it into gaseous component B and solid component B. Gaseous component B is discharged into the second gas-solid separation device 7 through the third flue gas outlet 71 located at the upper end of the second gas-solid separation device 7 for further separation and processing. Solid component B is discharged into the coke collection box B8 through the third coke outlet 72 to collect coke. The third flue gas outlet 71 is connected to the exhaust fan 9, so that the gaseous component B carrying a small amount of coke at the top of the first gas-solid separation device 5 can be discharged into the second gas-solid separation device 7 for further separation and processing by the air force provided by the exhaust fan 9.

[0042] It should be noted that the present invention does not limit the specific type of the first gas-solid separation device 5. As long as it can separate the residue introduced into the first gas-solid separation device 5 from the first coke outlet 13 into gas phase components and solid phase components, so as to achieve primary removal and recycling of residual coke at the bottom of the charcoal burner 1, this embodiment preferably uses a cyclone separator as the first gas-solid separation device 5.

[0043] This invention does not limit the specific type of the second gas-solid separation device 7, as long as it can further separate the coke powder from the gas phase components processed by the first gas-solid separation device 5, so as to remove the coke powder residue at the bottom of the charcoal burner 1, and at the same time avoid the coke powder from polluting the working or surrounding environment during the extraction process. In this embodiment, a dust collector bag filter is preferably used as the second gas-solid separation device 7, and the dust collector bag filter used in this embodiment is a dust collector bag filter equipped with a moving jet cleaning device 73, so that the moving jet cleaning device 73 can perform moving jet cleaning to avoid the dust collector bag filter from clogging, thereby improving the efficiency of removing coke powder. In this embodiment, the moving jet cleaning device 73 is a moving jet cleaning device 73 equipped with a sequential control system, so that the dust collector bag filter is purged under the action of the sequential control system to achieve the function of timely purging and declogging. It should be noted that the dust collector bag filter equipped with the above-mentioned mobile jet cleaning device is existing technology. Its structure and working principle are also existing technology, so this invention will not elaborate on them here. Moreover, the above-mentioned sequential control system is a common dust collector bag filter accessory in the prior art. Those skilled in the art should understand its working principle. When the pressure difference between the inlet and outlet of the dust collector bag filter is greater than a certain value, a nitrogen cannon can be triggered to vibrate the bag to remove the accumulated dust adhering to the bag, so as to prevent the bag filter from clogging and thus extend the service life of the bag.

[0044] Example 2

[0045] To further achieve effective removal of charcoal powder, ensuring that the density of charcoal powder remaining at the bottom of the charcoal burner is ≤5 kg / cm³ 3 In another preferred embodiment of the present invention, a density detector 10 is also provided at the lower end of the charcoal burner, so as to monitor the density of the residual coke powder in real time. When the density of the residual coke powder at the bottom of the charcoal burner is ≤5kg / cm³, 3 When the time is up, the clearing is considered complete.

[0046] Example 3

[0047] In order to facilitate the start or stop of the removal of residual coke powder at the bottom of the charcoal burner by opening or closing the first coke powder outlet 13 at the bottom of the charcoal burner 1, in another preferred embodiment of the present invention, the inlet end of the first gas-solid separation device 5 is connected to the first coke powder outlet 13 through the coke powder conduit 14, and a slide valve 15 is provided on the coke powder conduit 14 so that the slide valve 15 is only opened when the coke powder at the bottom of the charcoal burner 1 is removed after the shutdown, and remains closed during normal production.

[0048] Example 4

[0049] To further achieve effective removal of char residue and prevent it from being carried upwards by the conveying gas during the removal of residual char residue from the bottom of the charcoal burner 1, please refer to [link to relevant documentation]. Figure 1 In another preferred embodiment of the present invention, a plurality of first gas-solid separation devices 5, second gas-solid separation devices 7, and exhaust fans 9 are provided; and a plurality of second gas-solid separation devices 7 are connected in series with a corresponding first gas-solid separation device 5; a plurality of exhaust fans 9 are connected in series with a corresponding second gas-solid separation device 7, so that the residue discharged from the first coke outlet 13 can be separated simultaneously by multiple first gas-solid separation devices 5 (such as cyclone separators), thereby effectively improving working efficiency; and the solid component A after being processed by the cyclone separator will automatically fall after reaching the maximum bearing capacity of the wing valve 53, and will fall into the coke collection box A6 for collection through the gate valve 54. Then, the gas phase component A obtained by the plurality of first gas-solid separation devices 5 enters the corresponding second gas-solid separation device 7 (such as a dust collector bag filter) through its respective second flue gas outlet 51 for further dust removal treatment, and the solid component B after being processed by the dust collector bag filter will fall into the coke collection box B8 for collection.

[0050] Furthermore, by simultaneously providing pneumatic power through multiple sets of exhaust fans 9, the coke powder at the bottom of the charcoal burner 1 can be effectively and quickly guided into the cyclone separator and the dust collector bag filter for processing. The solid components separated by the cyclone separator and the dust collector bag filter are respectively guided into the coke powder collection box A6 and the coke powder collection box B8, thereby effectively and quickly removing the coke powder residue at the bottom of the charcoal burner 1, while also avoiding pollution to the working or surrounding environment during the extraction process.

[0051] Example 5

[0052] This embodiment provides a method for removing residual coke powder from inside a charcoal burner, including the following steps:

[0053] Step 1: Fluidize the residual coke powder at the bottom of the charcoal burner 1.

[0054] After the work is stopped, when the temperature inside the charcoal burner 1 drops to ≤100℃, connect the first coke outlet 13 of the charcoal burner 1 with the first gas-solid separation device 5, and start the oxygen supply fan 4 to provide conveying gas so that the residual coke at the bottom of the charcoal burner 1 is in a fluidized state.

[0055] It should be noted that, in this embodiment, the first coke outlet 13 is preferably connected to the inlet of the first gas-solid separation device 5 via the coke conduit 14, and a slide valve 15 is provided on the coke conduit 14. By opening the slide valve 15, the first coke outlet 13 is connected to the inlet of the first gas-solid separation device 5, so that the residual coke in the fluidized state in the charcoal burner 1 enters the first gas-solid separation device 5 under the action of the airflow provided by the oxygen supply fan 4 for preliminary separation treatment.

[0056] Step 2, Preliminary separation process

[0057] Turn on the exhaust fan 9 to provide pneumatic power, so that the residual coke in the fluidized state enters the first gas-solid separation device 5 under the action of the conveying air provided by the oxygen supply fan 4 and the pneumatic power provided by the exhaust fan 9, so as to separate it into gas phase component A and solid phase component A; solid phase component A is introduced into coke collection box A6.

[0058] Step 3, Secondary separation process

[0059] Under the combined action of the conveying gas provided by the oxygen supply fan 4 and the pneumatic force provided by the exhaust fan 9, the gas phase component A is introduced into the second gas-solid separation device 7 to further separate the component discharged from the second flue gas outlet 51 into gas phase component B and solid phase component B; solid phase component B is introduced into the coke powder collection box B8.

[0060] The density of residual coke powder at the bottom of the charcoal burner is ≤5 kg / cm³. 3 At that time, the removal of charcoal residue at the bottom of the charcoal burner 1 is completed. The present invention performs the above steps in sequence to remove charcoal residue at the bottom of the charcoal burner 1, while also avoiding pollution of the working or surrounding environment by charcoal during the extraction process.

[0061] Obviously, the above embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A method for removing residual coke powder from a charcoal burner based on a system for removing residual coke powder from a charcoal burner, characterized in that, The system for removing residual coke powder inside the charcoal burner includes: The charcoal burner (1) has a first flue gas outlet (11) at its upper end and an air inlet (12) and a first coke outlet (13) at its lower end; a density detector (10) is also provided inside the charcoal burner (1), which is used to monitor the density of the residual coke at the bottom inside the charcoal burner (1). A heat carrier riser (2) is vertically installed at the bottom of the charcoal burner (1), with its upper end extending upward into the charcoal burner (1); and its lower end is connected to a reactor (3). An oxygen supply fan (4) has its outlet connected to the air inlet (12) to provide oxygen to the charcoal burner (1); The first gas-solid separation device (5) has its inlet end connected to the first coke outlet (13) to separate the residue discharged from the first coke outlet (13) into gas phase component A and solid phase component A. The outlet of the solid phase component A is connected to a coke collection box A (6). The inlet end of the first gas-solid separation device (5) is connected to the first coke outlet (13) through a coke conduit (14), and a slide valve (15) is provided on the coke conduit (14). The second gas-solid separation device (7) has its inlet end connected to the outlet of the gas phase component A to further separate the gas phase component A into gas phase component B and solid phase component B. The outlet of the solid phase component B is connected to a coke powder collection box B (8). The exhaust fan (9) has its inlet end connected to the outlet of the gas phase component B; The method for removing residual coke from inside the charcoal burner based on the system for removing residual coke from inside the charcoal burner includes the following steps: Step 1: Fluidize the residual coke powder at the bottom of the charcoal burner (1). After the work is stopped, when the temperature inside the charcoal burner (1) drops to ≤100℃, connect the first coke outlet (13) of the charcoal burner (1) with the first gas-solid separation device (5), start the oxygen supply fan (4) to provide conveying gas, so that the residual coke at the bottom of the charcoal burner (1) is in a fluidized state. Step 2, Preliminary separation process Turn on the exhaust fan (9) to provide aerodynamic force, so that the residual coke in the fluidized state enters the first gas-solid separation device (5) under the action of the conveying gas provided by the oxygen supply fan (4) and the aerodynamic force provided by the exhaust fan (9), so as to separate it into gas phase component A and solid phase component A; the solid phase component A is introduced into the coke collection box A (6). Step 3, Secondary separation process Under the combined action of the conveying gas provided by the oxygen supply fan (4) and the pneumatic force provided by the exhaust fan (9), the gas phase component A is introduced into the second gas-solid separation device (7) to further separate the components discharged from the first gas-solid separation device (5) into gas phase component B and solid phase component B; the solid phase component B is introduced into the coke powder collection box B (8). The density of the residual coke powder at the bottom of the charcoal burner (1) is ≤5 kg / cm³. 3 At that time, the removal of the coke residue at the bottom of the charcoal burner (1) is completed.

2. The method for removing residual coke powder inside a charcoal burner based on a system for removing residual coke powder inside a charcoal burner as described in claim 1, characterized in that, The first gas-solid separation device (5), the second gas-solid separation device (7), and the exhaust fan (9) are each provided in multiple units; Furthermore, several second gas-solid separation devices (7) are connected in series with the first gas-solid separation device (5) in a one-to-one correspondence; Several of the aforementioned exhaust fans (9) are connected in series with the second gas-solid separation device (7) in a one-to-one correspondence.

3. The method for removing residual coke powder inside a charcoal burner based on a system for removing residual coke powder inside a charcoal burner as described in claim 1, characterized in that, The first gas-solid separation device (5) is a cyclone separator.

4. The method for removing residual coke powder inside a charcoal burner based on a system for removing residual coke powder inside a charcoal burner as described in claim 1, characterized in that, The second gas-solid separation device (7) is a dust collector bag filter, and the dust collector bag filter is a dust collector bag filter equipped with a mobile jet blowing device.

5. The method for removing residual coke in a charcoal burner based on a system for removing residual coke in a charcoal burner as described in claim 4, characterized in that, The mobile jetting device is a mobile jetting device equipped with a sequential control system.

6. The method for removing residual coke powder inside a charcoal burner based on a system for removing residual coke powder inside a charcoal burner as described in claim 1, characterized in that, The first gas-solid separation device (5) is equipped with a wing valve (53) inside and a slide valve (54) at the bottom.

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